Brazil's president Jair Bolsonaro has fought back, telling foreign powers not to interfere - but also earlier admitted his country lacks the resources to control the fires.

Meanwhile, major fashion companies from all over the world said on Friday they had signed a pact to protect the environment, which they'll present at the summit.

But it seems unlikely that the environment will be top of Donald's Trump's agenda at the G7.

The U.S. president, who has dismantled scores of environmental rules and rejected mainstream climate science, will instead use the summit to call on fellow leaders to be more like the States and follow the American economic model, to help stave off a global slowdown.